package com.sky.interceptor;

import com.sky.annotation.IgnoreToken;
import com.sky.constant.JwtClaimsConstant;
import com.sky.context.BaseContext;
import com.sky.properties.JwtProperties;
import com.sky.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //如果接口或者类上有@IgnoreToken注解，意思该接口不需要token就能访问，需要放行
        HandlerMethod handlerMethod = (HandlerMethod) handler;
        Method method = handlerMethod.getMethod();
        //先从类上获取该注解，判断类上是否加了IgnoreToken ，代表不需要token，直接放行
        IgnoreToken annotation = handlerMethod.getBeanType().getAnnotation(IgnoreToken.class);
        if(annotation == null){
            //再从方法上获取该注解
            if(method.isAnnotationPresent(IgnoreToken.class)){
                //annotation = handlerMethod.getMethodAnnotation(IgnoreToken.class);
                annotation = method.getAnnotation(IgnoreToken.class);
                log.info("请求方法 {} 上有注解 {} ",method.getName(),annotation);
            }
        }
        if(annotation != null){
            return true;
        }

        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户id：{}", userId);
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            System.out.println(ex);
            response.setStatus(401);
            return false;
        }
    }
}
